yes it lets you play youtube in the backgrojnd but while you use other apps but ^^^^^^when you lovk the screen it stops....it does not support lockscreen backround play.plus the problem of sdverts are always there

ok

i have tested it in samsung j7 prime,lg k7 and a few other phones

i will surely give it a shot but my method does work..

its very easy,just escape to home screen and press the headphone button once and the youtube starts to play in the background and you can close your screen and enjoy the youtube music.